sched: move RR_TIMESLICE from sysctl.h to rt.h

Originally submitted by Clark Williams as part of a cleanup,
but happens also to fix an ia64 build problem:

arch/ia64/kernel/init_task.c:38: error: 'RR_TIMESLICE' undeclared here (not in a function)

Signed-off-by: Clark Williams <clark.williams@gmail.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

include/linux/sched/rt.h

@@ -55,4 +55,10 @@ static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
 extern void normalize_rt_tasks(void);
 
 
+/*
+ * default timeslice is 100 msecs (used only for SCHED_RR tasks).
+ * Timeslices get refilled after they expire.
+ */
+#define RR_TIMESLICE		(100 * HZ / 1000)
+
 #endif /* _SCHED_RT_H */

include/linux/sched/sysctl.h

@@ -91,12 +91,6 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice;
 extern unsigned int sysctl_sched_autogroup_enabled;
 #endif
 
-/*
- * default timeslice is 100 msecs (used only for SCHED_RR tasks).
- * Timeslices get refilled after they expire.
- */
-#define RR_TIMESLICE		(100 * HZ / 1000)
-
 extern int sched_rr_timeslice;
 
 extern int sched_rr_handler(struct ctl_table *table, int write,